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74VCX16501 Low Voltage 18-Bit Universal Bus Transceivers with 3.6V Tolerant Inputs and Outputs
March 1998
Revised October 2004
74VCX16501
Low Voltage 18-Bit Universal Bus Transceivers
with 3.6V Tolerant Inputs and Outputs
General Description
The VCX16501 is an 18-bit universal bus transceiver which
combines D-type latches and D-type flip-flops to allow data
flow in transparent, latched, and clocked modes.
Data flow in each direction is controlled by output-enable
(OEAB and OEBA), latch-enable (LEAB and LEBA), and
clock (CLKAB and CLKBA) inputs. For A-to-B data flow, the
device operates in the transparent mode when LEAB is
HIGH. When LEAB is LOW, the A data is latched if CLKAB
is held at a HIGH or LOW logic level. If LEAB is LOW, the A
bus data is stored in the latch/flip-flop on the LOW-to-HIGH
transition of CLKAB. When OEAB is HIGH, the outputs are
active. When OEAB is LOW, the outputs are in a high-
impedance state.
Data flow for B to A is similar to that of A to B but uses
OEBA, LEBA, and CLKBA. The output enables are com-
plementary (OEAB is active HIGH and OEBA is active
LOW).
The VCX16501 is designed for low voltage (1.4V to 3.6V)
V
CC
applications with I/O capability up to 3.6V.
The VCX16501 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing low CMOS power dissipation.
Features
s
1.4V to 3.6V V
CC
supply operation
s
3.6V tolerant inputs and outputs
s
t
PD
(A to B, B to A)
2.9 ns max for 3.0V to 3.6V V
CC
s
Power-down high impedance inputs and outputs
s
Supports live insertion/withdrawal (Note 1)
s
Static Drive (I
OH
/I
OL
)
±
24 mA @ 3.0V V
CC
s
Uses patented noise/EMI reduction circuitry
s
Latchup performance exceeds 300 mA
s
ESD performance:
Human body model
>
2000V
Machine model
>
200V
Note 1:
To ensure the high-impedance state during power up or power
down, OEBA should be tied to V
CC
through a pull-up resistor and OEAB
should be tied to GND through a pull-down resistor; the minimum value of
the resistors is determined by the current-sourcing capability of the driver.
Ordering Code:
Order Number
74VCX16501MTD
Package Number
MTD56
Package Description
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
© 2004 Fairchild Semiconductor Corporation
DS500125
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74VCX16501
Connection Diagram
Pin Descriptions
Pin Names
OEAB
OEBA
LEAB, LEBA
CLKAB,
CLKBA
A
1
–A
18
B
1
–B
18
Description
Output Enable Input for A to B Direction
(Active HIGH)
Output Enable Input for B to A Direction
(Active LOW)
Latch Enable Inputs
Clock Inputs
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
Function Table
(Note 2)
Inputs
OEAB
L
H
H
H
H
H
H
LEAB
X
H
H
L
L
L
L
CLKAB
X
X
X
A
n
X
L
H
L
H
X
X
Outputs
B
n
Z
L
H
L
H
B
0
(Note 3)
B
0
(Note 4)
↑
↑
H
L
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial (HIGH or LOW, inputs may not float)
Z
=
High Impedance
Note 2:
A-to-B data flow is shown; B-to-A flow is similar but uses OEBA,
LEBA and CLKBA. OEBA is active LOW.
Note 3:
Output level before the indicated steady-state input conditions
were established.
Note 4:
Output level before the indicated steady-state input conditions
were established, provided that CLKAB was HIGH before LEAB went LOW.
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2
74VCX16501
Logic Diagram
3
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74VCX16501
Absolute Maximum Ratings
(Note 5)
Supply Voltage (V
CC
)
DC Input Voltage (V
I
)
Output Voltage (V
O
)
Outputs 3-STATED
Outputs Active (Note 6)
DC Input Diode Current (I
IK
) V
I
<
0V
DC Output Diode Current (I
OK
)
V
O
<
0V
V
O
>
V
CC
DC Output Source/Sink Current
(I
OH
/I
OL
)
DC V
CC
or Ground Current per
Supply Pin (I
CC
or Ground)
Storage Temperature Range (T
STG
)
−
0.5V to
+
4.6V
−
0.5V to
+
4.6V
−
0.5V to
+
4.6V
−
0.5 to V
CC
+
0.5V
−
50 mA
−
50 mA
+
50 mA
±
50 mA
±
100 mA
−
65
°
C to
+
150
°
C
Recommended Operating
Conditions
(Note 7)
Power Supply
Operating
Input Voltage
Output Voltage (V
O
)
Output in Active States
Output in 3-STATE
Output Current in I
OH
/I
OL
V
CC
=
3.0V to 3.6V
V
CC
=
2.3V to 2.7V
V
CC
=
1.65V to 2.3V
V
CC
=
1.4V to 1.6V
Free Air Operating Temperature (T
A
)
Minimum Input Edge Rate (
∆
t/
∆
V)
V
IN
=
0.8V to 2.0V, V
CC
=
3.0V
10 ns/V
Note 5:
The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the Absolute Maximum Rat-
ings. The Recommended Operating Conditions tables will define the condi-
tions for actual device operation.
Note 6:
I
O
Absolute Maximum Rating must be observed.
Note 7:
Floating or unused pin (inputs or I/O's) must be held HIGH or LOW.
1.4V to 3.6V
−
0.3V to 3.6V
0V to V
CC
0.0V to 3.6V
±
24 mA
±
18 mA
±
6 mA
±
2 mA
−
40
°
C to
+
85
°
C
DC Electrical Characteristics
Symbol
V
IH
Parameter
HIGH Level Input Voltage
Conditions
V
CC
(V)
2.7 - 3.6
2.3 - 2.7
1.65 - 2.3
1.4 - 1.6
V
IL
LOW Level Input Voltage
2.7 - 3.6
2.3 - 2.7
1.65 - 2.3
1.4 - 1.6
V
OH
HIGH Level Output Voltage
I
OH
= −100 µA
I
OH
= −12
mA
I
OH
= −18
mA
I
OH
= −24
mA
I
OH
= −100 µA
I
OH
= −6
mA
I
OH
= −12
mA
I
OH
= −18
mA
I
OH
= −100 µA
I
OH
= −6
mA
I
OH
= −100 µA
I
OH
= −12
mA
2.7 - 3.6
2.7
3.0
3.0
2.3 - 2.7
2.3
2.3
2.3
1.65 - 2.3
1.65
1.4 - 1.6
1.4
V
CC
−
0.2
2.2
2.4
2.2
V
CC
- 0.2
2.0
1.8
1.7
V
CC
- 0.2
1.25
V
CC
- 0.2
1.05
V
Min
2.0
1.6
0.65 x V
CC
0.65 x V
CC
0.8
0.7
0.35 x V
CC
0.35 x V
CC
V
V
Max
Units
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